package com.feng.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.feng.reggie.common.BaseContext;
import com.feng.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * 检查用户是否完成登录
 */
@WebFilter(filterName = "logincheckFilter",urlPatterns = "/*")
@Slf4j
public class LogincheckFilter implements Filter {
  private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request=(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

       //0.获得页面的请求路径
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
        //1.定义不需要处理的请求路径
        String[] url=new String[]{
          "/employee/login","/employee/logout","/backend/**","/front/**","/common/**","/user/sendMsg","/user/login"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(url, requestURI);

        //3.如果不需要处理，直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1.判断用户是否登录了，如果登录了也直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("employee"));
            Long empid = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empid);
            long id=Thread.currentThread().getId();
            log.info("线程id为：{}",id);
            filterChain.doFilter(request,response);
            return;
        }
        //4-2.判断移动端用户是否登录了，如果登录了也直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录,用户id为：{}",request.getSession().getAttribute("user"));
            Long empid = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(empid);
            long userid=Thread.currentThread().getId();
            log.info("线程id为：{}",userid);
            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5.如果没有登录返回结果，通过输出流向前端页面相应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));



       return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
  public boolean check(String[] urls,String requestURI) {
      for (String url : urls) {
          boolean match = PATH_MATCHER.match(url, requestURI);
          if (match) {
              return true;
          }

      }
      return false;

  }
}
